Air Force helicopters have flown in front of San Francisco's Golden Gate Bridge, and sharks do attack their prey by leaping out of the water. However, a Great White shark has never attacked a helicopter in San Francisco Bay. The top image was created by an unknown hoaxer who pasted an image of a breaching Great White (middle), taken by South African photographer Charles Maxwell, into a picture of a USAF helicopter hovering in front of the Golden Gate Bridge (bottom), taken by Lance Cheung.

A caption that often accompanied this image read:

AND YOU THINK YOUR HAVING A BAD DAY AT WORK !!
Although this looks like a picture taken from a Hollywood movie, it is in fact a real photo, taken near the South African coast during a military exercise by the British Navy.
It has been nominated by National Geographic as "THE photo of the year".

National Geographic had not nominated it as "photo of the year." But in 2005 National Geographic did publish an article debunking the photo as a hoax.